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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
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Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in real estate ventures - fair value | $ 49.3 | $ 47.3 |  |
Foreign currency forward contracts receivable | 0.0 | 0.0 |  |
Warehouse receivables | 0.0 | 0.0 |  |
Deferred compensation plan assets | 0.0 | 0.0 |  |
Mortgage banking derivative asset | 0.0 | 0.0 |  |
Total assets at fair value | 49.3 | 47.3 |  |
Foreign currency forward contracts payable | 0.0 | 0.0 |  |
Deferred compensation plan liabilities | 0.0 | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 0.0 | 0.0 |  |
Mortgage banking derivative liabilities | 0.0 | 0.0 |  |
Total liabilities at fair value | 0.0 | 0.0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments in real estate ventures - fair value | 0.0 | 0.0 |  |
Foreign currency forward contracts receivable | 1.8 | 13.2 |  |
Warehouse receivables | 419.6 | 317.5 |  |
Deferred compensation plan assets | 251.1 | 229.7 |  |
Mortgage banking derivative asset | 0.0 | 0.0 |  |
Total assets at fair value | 672.5 | 560.4 |  |
Foreign currency forward contracts payable | 9.0 | 1.9 |  |
Deferred compensation plan liabilities | 248.6 | 228.4 |  |
Business Combination, Contingent Consideration, Liability | 0.0 | 0.0 |  |
Mortgage banking derivative liabilities | 0.0 | 0.0 |  |
Total liabilities at fair value | 257.6 | 230.3 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 5.8 | 8.7 | $ 7.2 | $ 15.5
Investments in real estate ventures - fair value | 0.0 | 0.0 |  |
Foreign currency forward contracts receivable | 0.0 | 0.0 |  |
Warehouse receivables | 0.0 | 0.0 |  |
Deferred compensation plan assets | 0.0 | 0.0 |  |
Mortgage banking derivative asset | 29.6 | 19.0 |  |
Total assets at fair value | 29.6 | 19.0 |  |
Foreign currency forward contracts payable | 0.0 | 0.0 |  |
Deferred compensation plan liabilities |  | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 220.3 | 227.1 | $ 232.8 | $ 229.6
Mortgage banking derivative liabilities | 23.8 | 10.3 |  |
Total liabilities at fair value | $ 244.1 | $ 237.4 |  |

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